i Register
In some senses, scarce is marked as archaic, literary. Watch for register when choosing this word.
VERBS
be, seem
become, grow
Fresh water has become scarce in many parts of the world due to climate change.
remain
ADV
extremely, particularly, very
increasingly
Good teachers are becoming increasingly scarce in rural areas of the country.
pretty, rather, relatively, somewhat
Fresh supplies were pretty scarce during the winter months, so we had to plan carefully.